A police officer on the job interacting with the public does not have the same privacy rights as a citizen(you don't have the right to object to surveillance cameras on the street recording you dallying with an extra-marital partner, do you?). Except for reasonable exclusions like eating, doing your "personal business", etc., there is no reason that a uniformed police officer should object to his interactions being recorded, either by his own department or by a citizen. As Reagan famously quipped, "Trust but verify!".